“…Apo massif of Mindanao Island. Another important focus in Southeast Asia of research on biodiversity in swidden fallows is Papua New Guinea (Sillitoe The total number of farmers who grew the specified variety at least once during the 5 years study c Number of farmers who started to grow the variety after not growing it for more than 1 year during the 5 years study d Number of farmers who grew the variety and then stopped for at least 1 year during the 5 years study e Paddy rice 1995; Bowman et al 1990) With respect to the regional foci of this paper, northern Thailand and West Kalimantan, important contributions to our knowledge of biodiversity in fallow swiddens were made for West Kalimantan by Colfer et al (1997), Lawrence (2004a, b), Lawrence et al (1995), and Lawrence and Mogea (1996), and for northern Thailand by Lötsch (1958), Nakano (1978), Kunstadter 1978;Kunstadter et al (1978a, b), Sabhasri (1978), and SchmidtVogt (1998SchmidtVogt ( , 1999. Amazingly, fallows were once viewed as an acceptable, if "backward" way of restoring fertility, and they were often decried as "unproductive, unmanaged, and interesting only from the perspective of how [they] could be shortened" (Cairns 2007c).…”